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Penjelassan:
20 dm = 2 cm
25 dm = 2.5 cm
15 dm = 1.5 cm
2/12 = 1/6
2,5/15 = 0,5/3 = 5/10 / 3/1 = 5/10 × 1/3 = 5/30 = 1/6
1,5/9 = 0,5/3 = 5/10 / 3/1 = 5/10 × 1/3 = 5/30 = 1/6